Low-cost and sustainable organic thermoelectrics based on low-dimensional molecular metals

Huewe, Florian and Steeger, Alexander and Kostova, Kalina and Burroughs, Laurence and Bauer, Irene and Strohriegl, Vladimir and Woodward, Simon and Pflaum, Jens (2017) Low-cost and sustainable organic thermoelectrics based on low-dimensional molecular metals. Advanced Materials . ISSN 1521-4095

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More than 70 % of the primary energy consumed world-wide is wasted, mostly as heat below 100 °C[1]. Thermoelectric generators may convert a substantial amount of this energy into electrical power but high production costs and scarcity of efficient thermoelectric materials operating in this temperature regime have limited large-scale applications so far. Recently, conducting polymers have been proposed as potential candidates to meet these challenges showing appreciable low-temperature thermoelectric performance, but unfortunately suffering from low electrical conductivity due to inherent disorder[2–5]. Herein, crystalline low-dimensional molecular metals are demonstrated as an alternative class of thermoelectric materials combining the advantages of low weight, chemical variety, sustainability and high charge carrier mobility with reduced electronic dimensionality. For the first time determining all relevant thermoelectric quantities on individual organic crystals of both, p-type TTT2I3 and n-type DCNQI2Cu conductors, high power factors and promising figures of merit surpassing values of zT≥0.15 below 40 K are disclosed in this study. The cost-defining power output per active area of a prototypical, all-organic TEG takes unprecedented values of ~mW/cm2 at RT. Violation of the Wiedemann-Franz law and phonon drag effects emerge from the materials’ low-dimensionality and are expected to deliver further thermoelectric enhancement feasible in near future.

Item Type: Article
Additional Information: This is the peer reviewed version of the following article: F. Huewe, A. Steeger, K. Kostova, L. Burroughs, I. Bauer, P. Strohriegl, V. Dimitrov, S. Woodward, J. Pflaum, Adv. Mater. 2017, 1605682., which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/adma.201605682/abstract. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Keywords: Organic thermoelectric materials, Molecular metals, Radical ion salts, Thermal conductivity, Seebeck coefficient
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Chemistry
Identification Number: 10.1002/adma.201605682
Depositing User: Bramwell, Roseanna
Date Deposited: 16 Feb 2017 08:50
Last Modified: 18 Oct 2017 18:33
URI: http://eprints.nottingham.ac.uk/id/eprint/40593

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